backend/config.py

# config.py — Centralized configuration using pydantic-settings
# .env hanya menyimpan DB credentials & secrets
# Runtime config bisa diubah via API tanpa restart

import os
from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """Database & secrets — loaded from .env file."""
    DB_HOST: str = "localhost"
    DB_PORT: int = 3306
    DB_NAME: str = "sikomo_db"
    DB_USER: str = "root"
    DB_PASSWORD: str = ""
    API_SECRET_KEY: str = "default-key"
    DASHBOARD_PASSWORD: str = "Bandulan112"

    @property
    def DATABASE_URL(self) -> str:
        return (
            f"mysql+pymysql://{self.DB_USER}:{self.DB_PASSWORD}"
            f"@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
        )

    class Config:
        env_file = ".env"
        extra = "ignore"


@lru_cache()
def get_settings() -> Settings:
    return Settings()


class RuntimeConfig:
    """Runtime configuration — can be changed via dashboard API without restart."""

    def __init__(self):
        self.optuna_trials: int = int(os.getenv("OPTUNA_TRIALS", "30"))
        self.model_dir: str = os.getenv("MODEL_DIR", "models")
        self.forecast_days: int = int(os.getenv("FORECAST_DAYS", "7"))
        self.default_schedules: str = os.getenv("DEFAULT_SCHEDULES", "0 1 * * *")

    def to_dict(self) -> dict:
        return {
            "optuna_trials": self.optuna_trials,
            "model_dir": self.model_dir,
            "forecast_days": self.forecast_days,
            "default_schedules": self.default_schedules,
        }

    def update(self, key: str, value: str):
        allowed = {
            "optuna_trials": lambda v: setattr(self, "optuna_trials", int(v)),
            "model_dir": lambda v: setattr(self, "model_dir", v),
            "forecast_days": lambda v: setattr(self, "forecast_days", int(v)),
            "default_schedules": lambda v: setattr(self, "default_schedules", v),
        }
        if key not in allowed:
            raise ValueError(f"Key '{key}' tidak diizinkan untuk diubah.")
        allowed[key](value)


runtime_config = RuntimeConfig()